Mount St. Helens. Prior to 1980, Mount St. Helens formed a conical, youthful volcano sometimes known as the Fuji-san of America. During the 1980 eruption the upper 400 m of the summit was removed by slope failure, leaving a 2 x 3.5 km horseshoe-shaped crater now partially filled by a lava dome.ount St. Helens. Prior to 1980, Mount St. Helens formed a conical, youthful volcano sometimes known as the Fuji-san of America. During the 1980 eruption the upper 400 m of the summit was removed by slope failure, leaving a 2 x 3.5 km horseshoe-shaped crater now partially filled by a lava dome.
Definition of plantar. : of or relating to the sole of the foot plantar wart.
Plantar fibromatosis is a rare condition in which benign (non-cancerous) tumors called plantar fibromas grow on the bottom (plantar surface) of the foot. The plantar fascia is a long band of connective tissue that runs from the heel to the toes on the bottom of the foot. Plantar fibromas are firm masses that grow slowly along the plantar fascia, and they contain excess collagen or fibrotic tissue. They can be present in one or both feet.